diff --git a/src/operation/operation_model_interface.jl b/src/operation/operation_model_interface.jl
index e833b5e52..1250bcc1a 100644
--- a/src/operation/operation_model_interface.jl
+++ b/src/operation/operation_model_interface.jl
@@ -113,7 +113,8 @@ function solve_impl!(model::OperationModel)
         if !ispath(model_output_dir)
             mkdir(model_output_dir)
         end
-        model_export_path = joinpath(model_output_dir, "exported_$(model_name)_$(ts).json")
+        tss = replace!("$(ts)", ":" => "_")
+        model_export_path = joinpath(model_output_dir, "exported_$(model_name)_$(tss).json")
         serialize_optimization_model(container, model_export_path)
     end